[89] | 1 | #ifndef __openglhelper_2003_06_06_15_49__
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| 2 | #define __openglhelper_2003_06_06_15_49__
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| 3 |
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| 4 | #include "qglobal.h"
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| 5 |
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| 6 | #if QT_VERSION < 0x040000
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| 7 | # include <qgl.h>
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| 8 | #else
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| 9 | # include <QtOpenGL/qgl.h>
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| 10 | #endif
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| 11 |
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| 12 | #include <GL/glu.h>
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| 13 |
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| 14 | namespace Qwt3D
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| 15 | {
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| 16 |
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| 17 | #ifndef QWT3D_NOT_FOR_DOXYGEN
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| 18 |
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| 19 | class GLStateBewarer
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| 20 | {
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| 21 | public:
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| 22 |
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| 23 | GLStateBewarer(GLenum what, bool on, bool persist=false)
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| 24 | {
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| 25 | state_ = what;
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| 26 | stateval_ = glIsEnabled(what);
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| 27 | if (on)
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| 28 | turnOn(persist);
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| 29 | else
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| 30 | turnOff(persist);
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| 31 | }
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| 32 |
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| 33 | ~GLStateBewarer()
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| 34 | {
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| 35 | if (stateval_)
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| 36 | glEnable(state_);
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| 37 | else
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| 38 | glDisable(state_);
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| 39 | }
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| 40 |
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| 41 | void turnOn(bool persist = false)
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| 42 | {
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| 43 | glEnable(state_);
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| 44 | if (persist)
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| 45 | stateval_ = true;
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| 46 | }
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| 47 |
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| 48 | void turnOff(bool persist = false)
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| 49 | {
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| 50 | glDisable(state_);
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| 51 | if (persist)
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| 52 | stateval_ = false;
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| 53 | }
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| 54 |
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| 55 |
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| 56 | private:
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| 57 |
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| 58 | GLenum state_;
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| 59 | bool stateval_;
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| 60 |
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| 61 | };
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| 62 |
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| 63 | inline const GLubyte* gl_error()
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| 64 | {
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| 65 | GLenum errcode;
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| 66 | const GLubyte* err = 0;
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| 67 |
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| 68 | if ((errcode = glGetError()) != GL_NO_ERROR)
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| 69 | {
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| 70 | err = gluErrorString(errcode);
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| 71 | }
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| 72 | return err;
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| 73 | }
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| 74 |
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| 75 | inline void SaveGlDeleteLists(GLuint& lstidx, GLsizei range)
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| 76 | {
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| 77 | if (glIsList(lstidx))
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| 78 | glDeleteLists(lstidx, range);
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| 79 | lstidx = 0;
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| 80 | }
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| 81 |
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| 82 | //! get OpenGL transformation matrices
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| 83 | /**
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| 84 | Don't rely on (use) this in display lists !
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| 85 | \param modelMatrix should be a GLdouble[16]
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| 86 | \param projMatrix should be a GLdouble[16]
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| 87 | \param viewport should be a GLint[4]
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| 88 | */
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| 89 | inline void getMatrices(GLdouble* modelMatrix, GLdouble* projMatrix, GLint* viewport)
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| 90 | {
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| 91 | glGetIntegerv(GL_VIEWPORT, viewport);
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| 92 | glGetDoublev(GL_MODELVIEW_MATRIX, modelMatrix);
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| 93 | glGetDoublev(GL_PROJECTION_MATRIX, projMatrix);
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| 94 | }
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| 95 |
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| 96 | //! simplified glut routine (glUnProject): windows coordinates_p --> object coordinates_p
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| 97 | /**
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| 98 | Don't rely on (use) this in display lists !
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| 99 | */
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| 100 | inline bool ViewPort2World(double& objx, double& objy, double& objz, double winx, double winy, double winz)
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| 101 | {
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| 102 | GLdouble modelMatrix[16];
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| 103 | GLdouble projMatrix[16];
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| 104 | GLint viewport[4];
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| 105 |
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| 106 | getMatrices(modelMatrix, projMatrix, viewport);
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| 107 | int res = gluUnProject(winx, winy, winz, modelMatrix, projMatrix, viewport, &objx, &objy, &objz);
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| 108 |
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| 109 | return (res == GL_FALSE) ? false : true;
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| 110 | }
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| 111 |
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| 112 | //! simplified glut routine (glProject): object coordinates_p --> windows coordinates_p
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| 113 | /**
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| 114 | Don't rely on (use) this in display lists !
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| 115 | */
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| 116 | inline bool World2ViewPort(double& winx, double& winy, double& winz, double objx, double objy, double objz )
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| 117 | {
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| 118 | GLdouble modelMatrix[16];
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| 119 | GLdouble projMatrix[16];
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| 120 | GLint viewport[4];
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| 121 |
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| 122 | getMatrices(modelMatrix, projMatrix, viewport);
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| 123 | int res = gluProject(objx, objy, objz, modelMatrix, projMatrix, viewport, &winx, &winy, &winz);
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| 124 |
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| 125 | return (res == GL_FALSE) ? false : true;
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| 126 | }
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| 127 |
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| 128 |
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| 129 | #endif // QWT3D_NOT_FOR_DOXYGEN
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| 130 |
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| 131 | } // ns
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| 132 |
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| 133 | #endif
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